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<?php |
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/** |
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* This file is part of the daikon-cqrs/cqrs project. |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace Daikon\EventSourcing\Aggregate; |
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use Countable; |
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use Ds\Vector; |
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use Iterator; |
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use IteratorAggregate; |
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final class DomainEventSequence implements IteratorAggregate, Countable |
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{ |
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/** @var Vector */ |
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private $compositeVector; |
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public static function fromArray(array $eventsArray): DomainEventSequence |
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{ |
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return new static(array_map(function (array $eventState): DomainEventInterface { |
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$eventFqcn = self::resolveEventFqcn($eventState); |
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return call_user_func([ $eventFqcn, 'fromArray' ], $eventState); |
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}, $eventsArray)); |
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} |
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public static function makeEmpty(): DomainEventSequence |
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{ |
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return new self; |
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} |
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public function __construct(array $events = []) |
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{ |
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(function (DomainEventInterface ...$events): void { |
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$this->compositeVector = new Vector($events); |
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})(...$events); |
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} |
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public function push(DomainEventInterface $event): DomainEventSequence |
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{ |
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$expectedRevision = $this->getHeadRevision()->increment(); |
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if (!$this->isEmpty() && !$expectedRevision->equals($event->getAggregateRevision())) { |
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throw new \Exception(sprintf( |
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'Trying to add unexpected revision %s to event-sequence. Expected revision is %s', |
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$event->getAggregateRevision(), |
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$expectedRevision |
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)); |
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} |
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$eventSequence = clone $this; |
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$eventSequence->compositeVector->push($event); |
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return $eventSequence; |
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} |
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public function append(DomainEventSequence $events): DomainEventSequence |
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{ |
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$eventSequence = clone $this; |
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foreach ($events as $event) { |
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$eventSequence = $eventSequence->push($event); |
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} |
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return $eventSequence; |
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} |
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public function toNative(): array |
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{ |
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$nativeList = []; |
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foreach ($this as $event) { |
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$nativeRep = $event->toArray(); |
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$nativeRep['@type'] = get_class($event); |
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$nativeList[] = $nativeRep; |
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} |
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return $nativeList; |
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} |
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public function getHeadRevision(): AggregateRevision |
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{ |
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return $this->isEmpty() ? AggregateRevision::makeEmpty() : $this->getHead()->getAggregateRevision(); |
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} |
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public function getTailRevision(): AggregateRevision |
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{ |
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return $this->isEmpty() ? AggregateRevision::makeEmpty() : $this->getTail()->getAggregateRevision(); |
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} |
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public function getTail(): ?DomainEventInterface |
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{ |
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return $this->compositeVector->first(); |
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} |
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public function getHead(): ?DomainEventInterface |
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{ |
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return $this->compositeVector->last(); |
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} |
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public function getLength(): int |
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{ |
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return $this->count(); |
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} |
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public function isEmpty(): bool |
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{ |
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return $this->compositeVector->isEmpty(); |
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} |
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public function indexOf(DomainEventInterface $event): int |
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{ |
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return $this->compositeVector->find($event); |
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} |
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public function count(): int |
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{ |
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return $this->compositeVector->count(); |
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} |
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public function getIterator(): Iterator |
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{ |
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return $this->compositeVector->getIterator(); |
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} |
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private static function resolveEventFqcn(array $eventState): string |
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{ |
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if (!isset($eventState['@type'])) { |
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throw new \Exception('Missing expected typeinfo for event at key "@type" within given state-array.'); |
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} |
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$eventFqcn = $eventState['@type']; |
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if (!class_exists($eventFqcn)) { |
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throw new \Exception(sprintf('Can not load event-class "%s" given within state-array.', $eventFqcn)); |
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} |
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return $eventFqcn; |
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} |
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private function __clone() |
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{ |
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$this->compositeVector = clone $this->compositeVector; |
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} |
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} |
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daikon-cqrs /
event-sourcing
